An operating method of an electrostatic field oil-water separation system

Abstract

The invention relates to an operation method of an electrostatic field oil-water separation system. The electrostatic field oil-water separation system comprises an oil-water separation tank, a support, a press machine, a transformer, a degassed oil input port, an anode electrode plate, an annular cathode electrode plate, an oil outlet, an oil pumping pump, an upper pressure sensor, an upper dielectric constant sensor, an oil mud outlet, an oil mud pumping pump, a lower pressure sensor, a lower dielectric constant sensor, a control cabinet, an adapter module and a central computer. The operation method of the electrostatic field oil-water separation system has the advantages that the problems that crude oil dehydration rate is low, massive oil is contained in discharged water and energy consumption is high are solved, so that space of an electrostatic field is expanded, dehydration time of crude oil in the electrostatic field is shortened, dehydration efficiency is effectively improved, operation power consumption is reduced, production cost is reduced, energy conservation and environmental protection are achieved, height of an emulsion layer is effectively reduced, oil contained in the discharged water is reduced, sewage treatment cost and environmental protection pressure are reduced, structure is simple, operation is convenient, design thought is simple, an electrostatic field separation effect is good, and the operation method of the electrostatic field oil-water separation system is applicable to popularization and application.

Description

technical field [0001] The invention relates to the technical field of crude oil-water separation, in particular to an operating method of an electrostatic field oil-water separation system. Background technique [0002] At present, as most oilfields in China enter the late stage of production, on the one hand, the water content of the produced fluid increases. For example, the maximum water content of the produced fluid in Gudao Oilfield has reached 98%, and the water content of the produced fluid in some offshore oilfields can reach 99%. On the one hand, the trend of heavy and inferior crude oil in the late stage of exploitation is becoming more and more obvious. For example, the highest density of crude oil in Tahe Oilfield has exceeded 1g / cm3, and the density of Shengli ultra-heavy oil has also exceeded 1g / cm3: In addition, the oil recovery during deep mining The extensive use of additives has led to serious oil-water emulsification of the produced fluid in many oilfield...

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Problems solved by technology

[0002] At present, as most oilfields in China enter the late stage of production, on the one hand, the water content of the produced fluid increases. For example, the maximum water content of the produced fluid in Gudao Oilfield has reached 98%, and the water content of the produced fluid in some offshore oilfields can reach 99%. On the one hand, the trend of heavy and inferior crude oil in the late stage of exploitation is becoming more and more obvious. For example, the highest density of crude oil in Tahe Oilfield has exceeded 1g / cm3, and the density of Shengli ultra-heavy oil has also exceeded 1g / cm3: In addition, the oil recovery during deep mining The extensive use of additives has led to serious oil-water emulsification of the produced fluid in many oilfields, which has brought many problems to conventional oil-water separation: (1) The operation of electric dehydration equipment is unstable. Due to the high water content, poor properties and serious emulsification of the produced fluid, after After conventional oil-water separation, the water content may be high, and entering the electric dehydration equipment will cause the current to rise or even trip, which will affect the safe and stable operation of the electric dehydration equipment. At the same time, high current will increase the power consumption of the electric dehydration equipment; (2) The number of equipment stages Many, large area and high investment. Due to the low efficiency of conventional oil-water separation equipment, multi-stage separation is required to meet the water content requirements of crude oil, which will inevitably lead to a large number of equipment, increased floor space, and increased operation and maintenance costs; (3) The pressure on environmental protection is high. The poor quality of crude oil and the application of oil recovery additives lead to serious emulsification of crude oil production fluid. In addition, the conventional oil-water separation effect is poor, which will lead to excessive oil content in drainage, which will bring great pressure to sewage treatment and environmental protection.

[0003] Electrostatic field coagulation and dehydration technology is the most effective separation technology for oil-water emulsion, and has been widely used in the field of oil-water separation. However, traditional electrostatic coalescence technology uses two rectangular electrodes, and the space of electrostatic field is small, so it is difficult to achieve high water content crude oil. Good dehydration effect, can no longer adapt to the changing needs of the water content of crude oil, crude oil properties and mining methods in the current oilfield

[0004] The patent document with the application number 92208130.1 discloses a downhole oil-water separation and production device. The equipment consumes a lot of power during operation. After oil-water separation of high-water content well fluid, the water content is large and pollutes the environment.

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